ML12157A311

Part 21 - Steam Generator Tube Wear Adjacent to Retainer Bars

ML12157A311
Person / Time
Site:	San Onofre
Issue date:	06/04/2012
From:	Schultz M Mitsubishi Heavy Industries, Ltd
To:	Office of Nuclear Reactor Regulation
References
47990
Download: ML12157A311 (4)

Text

0610412012 U.S. Nuclear Regulatory Commission OperationsCenter Event Report Page I Part 21 (PAR) Event# 47990 Rep Org: MITSUBISHI HEAVY INDUSTRIES, LTD. Notification Date I Time: 04/19/2012 12:33 (EDT)

Supplier: MITSUBISHI HEAVY INDUSTRIES, LTD. Event Date / Time: 02/13/2012 (EST)

Last Modification: 06/04/2012 Region: Docket #:

City: Agreement State: No County: License #:

State:

NRC Notified by: MIKE SCHULTZ Notifications: CHRISTOPHER CAHILL R1DO HQ Ops Officer: HOWIE CROUCH STEVEN VIAS R2DO Emergency Class: NON EMERGENCY DAVE PASSEHL R3DO 10 CFR Section: HEATHER GEPFORD R4DO 21.21 (a)(2) INTERIM EVAL OF DEVIATION PART 21 GRP (EMAIL)

PART 21 - STEAM GENERATOR TUBE WEAR ADJACENT TO RETAINER BARS The following information was obtained from Mitsubishi Heavy Industries, LTD on April 19, 2012 was inadvertently added to Event Notification #47833 as an update to that event. The vendor's intent was to issue two interim reports; one for San Onofre Nuclear Generating Station (SONGS) Unit 2 and one for SONGS Unit 3. The information was obtained via fax:

"On January 31, 2012, San Onofre Unit 3 shut down due to indications of a steam generator tube leak. Steam generator tube inspections confirmed one small leak on one tube in one of the two steam generators. Continuing inspections of 100% of the steam generator tubes in both Unit 3 steam generators discovered unexpected wear, including tube to tube as well as tube to tube support structural wear. Inspection, testing, and analysis of SG tube integrity in both Unit 3 SGs is ongoing. In-situ pressure testing identified eight Unit 3 SG tubes that did not meet the target performance criteria in Technical Specification for tube integrity. One of the failed tubes was the leaking tube that required the Unit 3 shutdown.

"Discovery date: February 21, 2012 "Evaluation completion schedule date: August 31, 2012" Interim Report: U21-019-IR Reference Document: UET-20120105 Original notifications (per EN# 47833) were made to R1 DO (Joustra), R2DO (Nease), R3DO (Peterson), R4DO (O'Keefe), and Part 21 Group via email.

06/04/2012 U.S. Nuclear Regulatory Commission OperationsCenter Event Report Pafe 2 Part 21 (PAR) Event# 47990 Notified R1 DO (Cahill), R2DO (Vias), R3DO (Passehl), R4DO (Gepford) and Part 21 Groups via email.

• • • UPDATE FROM MITSUBISHI HEAVY INDUSTRIES, LTD VIA FAX ON 6/4/12 AT 1145 EDT ***

The vendor reported that eight Unit 3 SG tubes did not meet the target performance criteria in Technical Specifications for tube integrity.

Notified R1 DO (Cahill), R2DO (Vias), R3DO (Passehl), R4DO (Gepford) and Part 21 Groups via email.

06/04/2012 MON 11:49 PAX 703 908 8041 MNES U003/004 MITSUBUIHI HEAVY INDUSTRIES,. LTD.

UVS, Nuclear Regulatory Corrfnission Ref; UET-20120105 Revisioh 1 At~n: Document Contrbl Desk Date: June 1, 2012 Washington, DC 20555-0001 Subject, Interim Report of Evaluation lot a Deviation Pursuent -to 10 CFR 21.21 (a2'(2)

Mitsubishi Heavy Industries, LTD. I(MHI) has identified stean generator tube-tWio4Ue wear during iwrt cycle after steam generator replarement.

The following information is provided pursualnt tothe recluirement .of i10 CFR 21 to'submit a6n Interim report. ,on issues for which the evaluation Will not be Cpmpleteo1 within 60 days of discovery.

A6 ihterim relort on. the. evaluation Is aitached, specifically; Interim Report No. U21-019-1R Revisioh 1, whpre, teyfalons at U21;-019-IR Revision i are;

1) Changed #titlep

2) Changed "Nature of Deviation" acodring to title ohange.

Thop. MHI customers potentially affected by this issue haye beeon notified and will receive a

copy of this Interim report.

Yours very truly, Ei Kadokami Senior ,Vce*President Daepyty Head .of Nudlear Energy Systems Head of Kobe Shipyard & Machinery Works Mitsubishi Heavy Industries, Ltd.

06/04/2012 MON 11!49 FAX 703 908 8041 MNE5 2004/004 Attachment to UET-20120105 Revision 1 Interim Report U21 -019-1 Revision 1 Page .1 of 1

Subject:

Interim Report of evaluatioh pursuant to 10 0F192.21 (a) (2)

Title; Steam generakor fube to tUbeswear Idenftflelion of Balsic Component:

Replacement Steam Generators for San Onofre Nuclear Geheratlng Statlgn Unit 3 Basil; Component Supplied br Mitsubishi Heavy Industries, LTD.

"iure of POevlatlon:'

On January 31, 2012, San Onofre Unit 3 shut edwncdue to Indcications of 0 steam generator tube. leak. Steamh generator tube inspeioons confirmed one small leak on one tube in one of the tw0 steam generators. Continuing inspections of 100% qf th9e st6am geherator tubes In Joth Unit 3 steam generatorS diSCovered unexpected wear, tube to tube wear.

in-situ pressure testirig identified eight Unit 3 SG tubes that did, not !heet the target performance0 criteria in.Technical Specification for tube integrity. One. of the failed tvbbes was the i1e4king tube that requireO the Unit 3 shutdown.

Disove4ry Dote: February 21, 2012 Evaluation colnpletlon schedule date: August 31, 2012